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Earnings Per Share - Computation of basic and diluted net income (loss) per share (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]        
Net income attributable to APAM $ 23,736 $ 19,260 $ 43,250 $ 27,896
Less: Convertible preferred stock deemed dividends 0 0 0 22,694
Less: Allocation to participating securities, Basic 5,638 7,692 10,726 19,969
Net Income (Loss) Available to Common Stockholders $ 18,098 $ 11,568 $ 32,524 $ (39,402)
Weighted average shares outstanding 35,992,493 27,836,427 34,322,266 24,046,390
Earnings (loss) per share $ 0.50 $ 0.42 $ 0.95 $ (1.64)
Subsidiary Preferred Stock [Member]        
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]        
Less: Convertible preferred stock deemed dividends $ 0 $ 0 $ 0 $ 24,635